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Free Medical Coding > ICD10 CM > 2025 ICD-10-CM Codes > 2025 ICD-10-CM Codes G00-G99 – Diseases of the nervous system (G00-G99) > 2025 ICD-10-CM Codes G00-G09 – Inflammatory diseases of the central nervous system (G00-G09) > 2025 ICD-10-CM Codes G04 – Encephalitis, myelitis and encephalomyelitis (G04)

2025 ICD-10-CM Codes G04 – Encephalitis, myelitis and encephalomyelitis (G04)

Type 1 Excludes

  • encephalopathy NOS (G93.40)

Type 2 Excludes

  • acute transverse myelitis (G37.3-)
  • alcoholic encephalopathy (G31.2)
  • multiple sclerosis (G35)
  • myalgic encephalomyelitis (G93.32)
  • subacute necrotizing myelitis (G37.4)
  • toxic encephalitis (G92.8)
  • toxic encephalopathy (G92.8)

Includes

  • acute ascending myelitis
  • meningoencephalitis
  • meningomyelitis
  • Codes Description
  • G04.0
    Acute disseminated encephalitis and encephalomyelitis (ADEM)
  • G04.1
    Tropical spastic paraplegia
  • G04.2
    Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified
  • G04.3
    Acute necrotizing hemorrhagic encephalopathy
  • G04.8
    Other encephalitis, myelitis and encephalomyelitis
  • G04.9
    Encephalitis, myelitis and encephalomyelitis, unspecified

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